JPH04257635A - Air conditioner - Google Patents

Abstract

PURPOSE:To save energy, reduce cost, and simplify control of an air conditioning facility for a laboratory in which a local exhauster is installed. CONSTITUTION:A differential pressure control damper 9 is installed in a spot between a laboratory 2 wherein a draft chamber 13 is installed and a corridor 5. This differential pressure control damper 9 is set in such a fashion that the laboratory 2 may keep a negative internal pressure slightly higher than that of the corridor 5. When the draft chamber 13 operates, the internal pressure in the laboratory 2 drops so that the differential pressure against the corridor 5 may exceed a specified value. At that time, the differential pressure damper 9 is opened, thereby feeding air into the laboratory room 2 and maintaining constant the internal pressure in the laboratory 2, which forces the pressure in the corridor 5 to be reduced. An increased quantity of blowoff air is supplied thereinto from an air capacity modification device 6, thereby balancing the internal pressure in the corridor with open air. When the draft chamber 13 does not operate, a small amount of air enters the corridor 5 from the air capacity modification device 6 and is blown out by an exhaust fan 7.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to air conditioning equipment for facilities such as research institutes, factories, and hospitals that have rooms equipped with local exhaust ventilation.

0002

[Prior Art] In a room where a local exhaust device such as a draft chamber or a hood is installed, when the local exhaust device is started and stopped as necessary, there is a pressure difference between the room and the outside space. arise. Therefore, especially in the case of a closed room that is air-conditioned, various problems have occurred, such as difficulty in opening and closing the door and disruption of the air balance of the entire air conditioning system. In order to solve this problem, methods have been considered to keep the pressure inside the room constant. In other words, (1) a method of keeping the local exhaust system running at all times, even when local exhaust is not required; or (2) a method of using a pressure sensor and changing the blowout air volume according to the air pressure detected by the sensor. This method involves installing an air conditioner (hereinafter referred to as a variable air volume device) in the room and supplying air into the room commensurate with the amount of air discharged by the operation of the local exhaust device.

0003

[Problem to be solved by the invention] In the method (1) above, since the local exhaust system is kept in operation at all times, a large amount of air whose temperature and humidity have been adjusted and dust removed has to be exhausted, resulting in a large amount of waste. It's a waste of energy. In facilities that have many rooms equipped with local exhaust ventilation systems, it is not practical to adopt method (2) above and install a variable air volume system in each room for automatic control, as it would be costly. . Further, variable air volume devices are usually installed in the ceiling, but it is complicated to manage a large number of variable air volume devices because they are installed in each room, and this is not desirable from the perspective of saving space. As described above, air conditioning equipment for rooms equipped with local exhaust ventilation devices has the problems of saving energy, reducing costs, and simplifying management.

0004

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an air conditioning system for a room in which a local exhaust system is installed, which includes an air-conditioned space provided separately from the room, and an air-conditioned space provided separately from the room. Provided is an air conditioning system, characterized in that a differential pressure adjusting damper is installed between the room and the space, and the room and the space can communicate with each other via the differential pressure adjusting damper.

[0005] The present invention also provides an air conditioning system for a plurality of rooms in which a local exhaust system is installed, which is provided separately from the plurality of rooms and has a difference between each of the air-conditioned spaces and the plurality of rooms. Provided is an air conditioning system, characterized in that a pressure regulating damper is installed, and the plurality of rooms and the space can communicate with each other via the differential pressure regulating damper.

[0006] Preferably, the air conditioner includes a pressure sensor for detecting the pressure in the space, and a variable air volume device that changes the amount of air blown into the space depending on the pressure in the space.

[0007]

[Operation] In the air conditioning system of the present invention, a differential pressure adjustment damper is installed between the room in which the local exhaust system is installed (hereinafter referred to as the laboratory) and the air-conditioned space provided outside the room. . This differential pressure adjustment damper is for always maintaining the pressure difference between the laboratory and the space at a constant value. The space is usually a hallway adjacent to the laboratory through a door, and is air-conditioned to have the same pressure as the outside pressure, for example. By setting the differential pressure adjustment damper so that the pressure in the laboratory is always maintained at a negative pressure of about -1 to -3 mmH2O compared to the pressure in the hallway, it is possible to prevent the air in the laboratory from flowing back into the hallway. The differential pressure adjustment damper is installed in a convenient location, such as above the wall that separates the hallway from the laboratory, or at the door for entering the laboratory from the hallway.

[0008] In the equipment of the present invention, air from an air conditioner (hereinafter referred to as an outside conditioner) for taking in outside air and adjusting temperature and humidity is not only sent to the laboratory, but also to the space through another route. I will also send it to the hallway where it will be. Then, when the pressure inside the laboratory decreased by activating the local exhaust system,
The differential pressure adjustment damper is activated and air from the hallway is introduced into the laboratory. When the air from the hallway is introduced into the laboratory,
Although the pressure in the hallway decreases, it is desirable to have a mechanism that automatically pumps air into the hallway in an amount commensurate with the amount of air discharged. For example, a pressure sensor and a variable air volume device linked to it can be installed in the hallway so that the pressure in the hallway is always the same as the outside air, and when the pressure drops, a large amount of air can be automatically sent into the hallway. Keep it. When air is not being introduced into the laboratory from the hallway, the amount of air supplied from the variable air volume device into the hallway is small, and the air in the hallway is left as it is or is transferred to another room following the hallway. (e.g., toilets, etc.) and is exhausted by an exhaust fan.

[0009] Furthermore, in the case of a facility that has many rooms equipped with local exhaust ventilation systems, a common corridor adjacent to each laboratory is provided as the space, and between the common corridor and each laboratory, A differential pressure adjustment damper will be installed in each. As a result, in laboratories using local exhaust systems, differential pressure regulating dampers are activated and air is introduced from the hallway. Furthermore, the drop in pressure within the hallway can be resolved by installing and operating one variable air volume device and pressure sensor in a common hallway.

0010

[Examples] The present invention will be explained in detail with reference to Examples below. Regarding an example of the air conditioning equipment of the present invention, FIG. Figure 2 shows the operating state at
FIG. 3 shows the arrangement of each component device.

[0011] This air conditioning equipment mainly includes an outside air conditioner 1, a variable air volume device 6, an air conditioner (hereinafter referred to as a constant air volume device) 3 that always supplies air at a constant volume of air, a laboratory 2, a hallway 5,
It consists of a differential pressure adjustment damper 9 and each exhaust fan. This hallway 5 corresponds to a separate space in the present invention, and as can be seen from FIG. 3, it is adjacent to the laboratory 2 via a door. A pressure sensor 11 is attached to the outside air conditioner 1 so that the pressure of the air blown out is always constant. Inside the laboratory 2, a draft chamber 13 is installed as a local exhaust system, and a fan coil unit 12 having a pipe from a machine room (not shown) is installed. Ventilation air whose temperature and humidity have been adjusted to a certain degree by an outdoor air conditioner 1 is fed into this laboratory 2 through a constant air volume device 3, and a constant exhaust fan 4
is discharged by The temperature and humidity inside the laboratory 2 are controlled by a fan coil unit 12. Corridor 5
The air that has passed through the variable air volume device 6 is sent from the outdoor air conditioner 1 to the room, and the air passes through another room (in this case, the toilet) following the hallway 5 and is exhausted from the exhaust fan 7. It is set as. This variable air volume device 6 is linked to a pressure sensor 10 that detects the pressure inside the hallway 5, and adjusts the amount of air blown so that the pressure inside the hallway 5 is always the same as the outside air.
Air is introduced into the hallway 5. The differential pressure adjustment damper 9 is shown in FIG.
As can be seen, it is installed above the wall that separates the hallway 5 and the laboratory 2. This differential pressure adjustment damper 9 is set so that the laboratory room 2 maintains a negative pressure of about -1 to -3 mmH2O with respect to the corridor 5. Note that the differential pressure adjusting damper can be a mere opening (hole) when there is no need to maintain the differential pressure at a constant value.

As shown in FIG. 1, during normal operation when the draft chamber 13 is not in operation, the local exhaust fan 8 does not operate, and the pressure in the laboratory 2 is the negative pressure set with respect to the pressure in the corridor 5. It is not below. Therefore, the differential pressure regulating damper 9 remains closed. Therefore, the air that enters the hallway 5 only passes through the toilet and is exhausted by the exhaust fan 7.

As shown in FIG. 2, when the draft chamber 13 is operated in the laboratory 2, the local exhaust fan 8 is activated, air is exhausted from there, and the pressure in the laboratory 2 is reduced. Therefore, the differential pressure adjustment damper 9 detects the pressure difference between the hallway 5 and the laboratory room 2, and air is supplied from the hallway 5 into the laboratory room 2. The accompanying pressure drop in the hallway 5 is detected by the pressure sensor 10, and the variable air volume device 6 is activated. This variable air volume device 6 automatically supplies a large amount of air into the hallway 5 until the pressure inside the hallway 5 becomes the same as the outside air. When the draft chamber 13 is stopped, the local exhaust fan 8 is stopped, and the pressure difference between the corridor 5 and the laboratory room 2 returns to the set value, the differential pressure adjustment damper 9 is closed and the supply of air ends.

FIG. 4 shows an example of a case where a large number of laboratories 2 are provided. A common hallway 5 adjacent to each laboratory 2 is provided, and a differential pressure adjustment damper 9 is installed between the common hallway 5 and each laboratory 2. Each differential pressure adjustment damper 9 is
As in the previous example, it is installed above the wall that separates the corridor 5 and the laboratory 2. Each laboratory 2 has an air outlet 15.
Air from the constant air volume device 3 is introduced, circulates within the room, and is constantly discharged from the suction port 16 through the exhaust fan 4. Further, a fan coil unit 12 is installed in each laboratory 2 to adjust the temperature and humidity within the laboratory 2. In the laboratory where the draft chamber 13 is in operation, the differential pressure adjustment damper 9 is opened and the laboratory 2 is opened from the corridor 5.
Air is introduced into the interior. The pressure in the hallway 5 is detected by a pressure sensor 10, and the insufficient air is replaced by a variable air volume device 6.
The air is introduced from the air via a plurality of air outlets 14.

[0015]

[Effects of the Invention] As explained above, the air conditioning equipment of the present invention can respond to fluctuations in the amount of indoor air discharged due to the operation and stoppage of the local exhaust system in a room where a local exhaust system is installed. Provide minimal air supply. Therefore, there is no need to exhaust a large amount of conditioned air due to the constant operation of a local exhaust system, as in the past, and significant energy savings can be achieved.

[0016] Furthermore, in facilities that have rooms equipped with a large number of local exhaust systems, there is no need to install variable air volume devices in each room, so the number of automatic control points can be significantly reduced, and equipment management is simplified. become. This leads to significant cost reductions.

Furthermore, the set pressure difference of the differential pressure adjustment damper is
By making the pressure within the laboratory slightly negative relative to the separate space, air within the laboratory is prevented from flowing back into that space. Therefore, when the local exhaust system is in operation, it is possible to prevent the emitted odor, gas, etc. from spreading into the hallway, thereby improving safety.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing the operating state of an embodiment of the air conditioning equipment of the present invention during normal operation.

FIG. 2 is a process diagram showing the operating state of an embodiment of the air conditioning equipment of the present invention during local exhaust operation.

FIG. 3 is a plan view showing the arrangement of constituent devices of an embodiment of the air conditioning system of the present invention.

FIG. 4 is a plan view showing an embodiment of the air conditioning equipment of the present invention.

[Explanation of symbols]

1　　　External conditioning machine 2 Laboratory 3. Constant air volume device 4 Constant exhaust fan 5 Corridor 6 Variable air volume device 7 Exhaust fan 8 Local exhaust fan 9 Differential pressure adjustment damper 10 Pressure sensor 11 Pressure sensor 12 Fan coil unit 13 Draft chamber 14 Air outlet 15 Air outlet 16 Suction port 17 Exhaust duct 18 Air supply duct

Claims (3)

[Claims] Claim 1: In an air conditioning system for a room in which a local exhaust system is installed, a differential pressure adjustment damper is installed between an air-conditioned space provided separately from the room and the room, and the differential pressure adjustment damper is installed between the room and the air conditioned space provided separately from the room. An air conditioning system characterized in that the room and the space can communicate with each other via a damper. 2. In an air conditioning system for a plurality of rooms in which a local exhaust system is installed, a differential pressure regulating damper is provided between each of the plurality of rooms and an air-conditioned space provided separately from the plurality of rooms. An air conditioning system characterized in that the plurality of rooms and the space can communicate with each other through the differential pressure adjusting dampers. 3. The air conditioner according to claim 1, further comprising: a pressure sensor for detecting the pressure within the space; and a variable air volume device that changes the volume of air blown into the space depending on the pressure within the space. Air conditioning equipment as described in.